Abstract
Since 1978, three national metrology institutes (NMI) have submitted seven samples of known activity of 99Mo to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures. The activities ranged from about 8.8 MBq to 1.5 GBq. The degrees of equivalence between each equivalent activity measured in the SIR and the key comparison reference value (KCRV) have been calculated and the results are given in the form of a matrix for three NMIs. A graphical presentation is also given.
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The final report has been peer-reviewed and approved for publication by Section II of the Consultative Committee for Ionizing Radiation (CCRI(II)), comparison identifier BIPM.RI(II)-K1.Mo-99, according to the provisions of the Mutual Recognition Arrangement (MRA).